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Calculate the ratio of the drag force on a jet flying at 1140 km/h at an altitude of 10 km to the drag force on a prop-driven transport flying at half that speed and altitude. The density of air is 0.38 kg/m3 at 10 km and 0.67 kg/m3 at 5 km. Assume that the airplanes have the same effective cross-sectional area and drag coefficient C.
A converging lens of focal length 20 cm is used to form a real image 1.0 m away from the lens. How far from the lens is the object
A strong weightless rope has a mass m hanging from the middle of it, as shown. The tension force on each rope is 25 N, and the rope droops at an angle of 20.0°. How much mass is hanging from the rope?
A bullet mass 7.1 grams is fired from a gun with a muzzle velocity of 1,078 mph. It embeds itself 77.3 cm in a wood post. What was the average force on the bullet in slowing it to a stop?
A magnetic field has a magnitude of 0.0011 T, and an electric field has a magnitude of 4.4 × 103 N/C. obtain the magnitude of the net force that acts on the charge
A cargo plane is flying horizontally at an altitude of 20.0 km with a speed of 888 km/h when a large crate falls out of the rear loading ramp. How long does it take the crate to hit the ground
Inside the tube is a uniformelectric field of 4.50*10-4 N/C pointing in negativey-direction. How far does the particle travel before hitting the tube wall.
q1. what is the frequency shift of a 68 police radar signal when it reflects off a car moving at 117? radar waves
Gas in a container is at a pressure of 2.4 atm and a volume of 3.8m3. what is the work done on the gas if it expands at constant pressure to twice its initial volume?
A pyramid has a square base and four faces which are equilateral triangles. A charge Q is placed on the center of the base of the pyramid, What is the net flux of electric field
At the low point in it swing, a pendulum bob with a mass of 0.46 kg has a velocity of 2.2 m/s. What is its kinetic energy at the low point
A 75kg person goes down a straight slide inclined at 32 degrees above the horizontal. what is the persons acceleration
Vector A ? has magnitude 10.0m m and vector B ? has magnitude 18.0m m . The scalar product A ? ?B ? is 90.0m 2. What is the magnitude of the vector product
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